The simple power of the Canvas is that it gets and keeps people literally on the same page. Usually, people work without a robust model like the Canvas.
As a result, people are not all and always on the same page. Some people know some of the questions and facts people have. Some questions and facts are recorded in a fragmented mix of meeting documentation and emails that not everyone has. Not everyone's principles and stories are expressed and documented. Not all of everyone's available time, talents and resources are engaged through the process.
These dynamics lead to the fact that people are continuously not exactly on the same page and the efforts and results reflect that. The Canvas changes all this. Everything is captured, archived and engaged in the process. People stay on the same page and the efforts and results reflect that.